tsconfig.json

{
  "include": [
    "src/**/*"
  ],
  "compilerOptions": {
    "removeComments": false,
    "skipLibCheck": true,
    "esModuleInterop": true,
    "noLib": false,
    "strict": true,                        /* Enable all strict type-checking options. */
    "noImplicitAny": false,                 /* Raise error on expressions and declarations with an implied 'any' type. */
    "strictNullChecks": true,              /* Enable strict null checks. */
    "strictFunctionTypes": true,           /* Enable strict checking of function types. */
    "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
    "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
    "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
    "downlevelIteration": true,

    /* Additional Checks */
    "noUnusedLocals": true,                /* Report errors on unused locals. */
    "noUnusedParameters": false,            /* Report errors on unused parameters. */
    "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
    "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
    "forceConsistentCasingInFileNames": true,
    "allowSyntheticDefaultImports": true,

    "noEmit": false,
    "sourceMap": true,
    "target": "es6",
    "lib": ["es6", "dom", "es2017.string"],
    "moduleResolution": "node",
    "allowJs": true,
    "jsx": "react"
  }
}